“…Most of the application fields envisaged for atomic magnetometers were identified on the basis of their excellent sensitivity, and, in the case of radio-frequency magnetometers, on their response to high-frequency fields. In addition to their use as state-of-the-art detectors in fundamental physics experiments [9], among these application fields emerges the detection of bio-magnetism, e.g., in the construction of magneto-encephalographs [10,11], magneto-cardiographs [12][13][14], and magneto-miographs [15]. Another promising area is represented by nuclear magnetic resonance in ultra-low (e.g., at microtesla level) or even vanishing fields, where atomic magnetometers find use as non-inductive detectors [16][17][18][19][20], and also in imaging experiments [21][22][23][24].…”